Comment 15 for bug 139403

https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/133374 was where I came from, and that description seems to match my problem very exactly. However, it is listed as a duplicate of this bug, and when I read this one I am unable to understand the relationship.

To recap: After booting, the computer is not connected to the network. If I disable the network and enable it again, then it will connect and work normally.

I have not seen any similar problems on about half-a-dozen machines that I've installed Ubuntu on, but this installation is my first on a Sharp notebook. I've looked at the nine basic logs, but failed to find the parts corresponding to the stuff described in bug 133374.